CN101257367B - Method and device for choosing precoding - Google Patents

Method and device for choosing precoding Download PDF

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Publication number
CN101257367B
CN101257367B CN2007100843820A CN200710084382A CN101257367B CN 101257367 B CN101257367 B CN 101257367B CN 2007100843820 A CN2007100843820 A CN 2007100843820A CN 200710084382 A CN200710084382 A CN 200710084382A CN 101257367 B CN101257367 B CN 101257367B
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precoding
channel condition
condition information
weighting
channel
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CN101257367A (en
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黄敏
缪蔚
周世东
邬钢
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Tsinghua University
Koninklijke Philips NV
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Tsinghua University
Koninklijke Philips Electronics NV
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Application filed by Tsinghua University, Koninklijke Philips Electronics NV filed Critical Tsinghua University
Priority to CN2007100843820A priority Critical patent/CN101257367B/en
Priority to TW096107383A priority patent/TWI413370B/en
Priority to KR1020097020042A priority patent/KR101346123B1/en
Priority to JP2009551292A priority patent/JP5295980B2/en
Priority to PCT/IB2008/050643 priority patent/WO2008104907A2/en
Priority to US12/528,096 priority patent/US8300727B2/en
Priority to EP08719450.2A priority patent/EP2115979B2/en
Publication of CN101257367A publication Critical patent/CN101257367A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
    • H04L2025/03802—Signalling on the reverse channel

Abstract

The invention provides a method for selecting the precoding in the base station for the base station in order to optimize the selection of the precoding in the multi-user system. The method comprises the steps of that: transmitting a plurality of pilot signals without precoding to a plurality of terminals; receiving a plurality of feedback signals from plural terminals, wherein at least one feedback signal comprises a plurality of command precoding information and a plurality of channel state information, each channel state information corresponds to a command precoding information; generating a precoding matrix based on a plurality of feedback signals, wherein, the at least precoding in the precoding matrix is determined on the basis of correlation coefficient between the command precoding; operating the transmission by means of the precoding matrix. The method can expand the selection space of the precoding and improve the general transmission speed and system capacity of the whole system by comprehensively considering the correlation between the precoding and the different channel state information corresponding to the different precoding.

Description

Select the method and apparatus of precoding
Technical field
The present invention relates to multi-user's multiple-input, multiple-output (MIMO) communication system, relate in particular to the method and apparatus of in multi-user MIMO communication system, selecting precoding.
Background technology
Next generation communication system aims to provide high speed data transfers, high spectrum utilization and large power system capacity, and the MIMO technology has been proved to be and can have improved significantly message transmission rate and power system capacity, thereby obtained paying close attention to widely and studying in recent years.But, in multi-user's mimo system, antenna between the different user is separate, cause and to effectively utilize such as joint-detection in user terminal one side, the technology such as space encoding, thereby require the information about channel characteristics etc. that each terminal is obtained is transferred to network one side, thereby can in the base station, further adopt such as technology such as multi-user interference cancellations.
But, in real system, because portable terminal is to the limited bandwidth of the feedback channel of base station, limited the feedack amount, thereby be necessary to propose a kind of method, so that in the situation that Limited Feedback and user selection diversity, the base station can obtain the information such as channel characteristics known to each terminal more exactly, thereby for the different channels feature of different user, by optimizing the selection of precoding, improve message transmission rate and power system capacity etc.
In order to optimize the selection of precoding, the patent application document EP1699145A2 that SAMSUNG company submitted in March, 2006, among " wave beam in the mimo system and power distribution method " (B eam and power allocation method for MIMO communicationsystem), a kind of every user rate control method PU2RC (per-user unitaryrate control) has been proposed.But, PU2RC has a restriction, namely requiring the used pre-coding matrix in base station must be unitary matrice (unitary matrix), namely any two precoding vectors in this pre-coding matrix must be mutually orthogonal, thereby limited the selection space of precoding, the pre-coding matrix that causes selecting as a rule can only be looked after the requirement of transmission rate and the signal to noise ratio of certain customers, sacrificed other user's performance, and then limited whole system and made as a whole total message transmission rate and power system capacity.
Therefore, be necessary to propose a kind of method, can further by optimizing the selection of precoding, improve total message transmission rate and the power system capacity of system.
Summary of the invention
One of purpose of the present invention provides a kind of method of recommending precoding, terminal can be obtained about the precoding feedback of the information of channel and desired use to the base station.
Another object of the present invention provides the method for a transfer of data, based on the information of each terminal feedback, optimizes the selection of precoding in the base station, thereby improves the performance of whole system.
In order to optimize the selection of precoding in the multi-user MIMO system, according to one embodiment of the present of invention, a kind of method of the recommendation precoding for carrying out in terminal is provided, the method comprising the steps of: utilize a plurality of reception signals, calculate a channel response matrix, each unit of this channel response matrix is for the channel response of a channel between the base station of describing this terminal and a correspondence; Utilize a predefine precoding group and this channel response matrix, calculate a plurality of channel condition informations, each channel condition information is corresponding to a precoding in the predefine precoding group; Utilize the coefficient correlation between each precoding and corresponding a plurality of channel condition information in the predefine precoding group, from this predefine code set, select a plurality of precodings to recommend precoding group as one; A plurality of channel condition informations with recommend precoding group and correspondence based on this produce a feedback signal, send to the base station, and wherein, each channel condition information corresponds respectively to a recommendation precoding of recommending in the precoding group.
According to one embodiment of the present of invention, provide a kind of for the method at the multi-user MIMO system the transmission of data, this multi-user MIMO system comprises a base station and a plurality of terminal, the method comprising the steps of: receive a plurality of feedback signals of sending from a plurality of terminals, at least one feedback signal comprises a plurality of recommendation precoding informations and a plurality of channel condition information (CSI), each channel condition information is recommended precoding information corresponding to one, and each recommends precoding information to be respectively applied to determine that corresponding in a predefine precoding group precoding is with as the recommendation precoding; Based on these a plurality of feedback signals, produce a pre-coding matrix, wherein, at least one precoding in this pre-coding matrix is based at least two and recommends coefficient correlations between the precoding to determine; With utilize this pre-coding matrix and carry out the transmission operation.
Alternatively, in the step that produces pre-coding matrix, further comprise: from all channel condition informations, select a maximum channel state information; Determine a precoding and a terminal corresponding to this maximum channel state information, and corresponding to this transmitting antenna determining precoding and should determine terminal, should determine to distribute that precoding was to this transmitting antenna; For remaining each channel condition information, according to definite precoding with corresponding to the coefficient correlation between the precoding of this channel condition information, this channel condition information is weighted operation, to obtain a corresponding weighting channel condition information; From all weighting channel condition informations, select a maximum weighted channel condition information; With a precoding and a terminal of determining corresponding to this maximum weighted channel condition information, to distribute new definite precoding of determining to this terminal.
Alternatively, the method further comprises step: for each the weighting channel condition information that produces in a last time weighting step, according to definite precoding last time determining in the determining step at one with corresponding to the coefficient correlation between the precoding of this weighting channel condition information, this weighting channel condition information is weighted operation, to upgrade this weighting channel condition information; From all weighting channel condition informations that upgrade, select a maximum weighted channel condition information; With a precoding and a terminal of determining corresponding to the maximum weighted channel condition information, and corresponding to a transmitting antenna of this terminal, should determine to distribute that precoding was to this transmitting antenna.
Basic ideas of the present invention are: in the base station, the different channels feature of utilizing correlated characteristic between each precoding vector and a plurality of terminal to obtain, select as far as possible the precoding of good relationship to form a pre-coding matrix, the data of transmission are carried out the precoding modulation.Be different from the method that EP1699145A2 proposes, the generation of this pre-coding matrix is not that the size that merely compares channel response is selected precoding, but consider correlated characteristic between the precoding vector and the size of corresponding channel response, select namely corresponding to larger channel response, each other again preferably a plurality of precodings of correlation form pre-coding matrix.Method of the present invention does not also require between any two precodings in this pre-coding matrix mutually strictly quadrature, thereby widened the selection space of precoding, can consider fully the needs of different user, improve total message transmission rate and the power system capacity of whole system.
Alternatively, in terminal, utilize the correlated characteristic between known a plurality of precodings, the channel response of the different channels that measures is weighted, recommend precoding group thereby produce one.Be different from the method that EP1699145A2 proposes, the generation of this recommendation precoding group is not that the size of merely more a plurality of channel responses is recommended precoding, but in conjunction with the correlated characteristic between the precoding vector and channel response correspondingly, recommend namely corresponding to larger channel response each other again preferably precoding of correlation.
By below in conjunction with the content in the description of the drawings and claims, and along with more fully understanding for of the present invention, other purposes of the present invention and the effect more clear and easy to understand that will become.
Description of drawings
Fig. 1 illustrates, and implements according to one embodiment of the present of invention, produces the flow chart of recommending precoding group in terminal;
Fig. 2 illustrates, according to the particular flow sheet of the recommendation step of one embodiment of the present of invention;
Fig. 3 illustrates, and implements according to one embodiment of the present of invention, produces the flow chart of pre-coding matrix in the base station;
Fig. 4 illustrates, according to the particular flow sheet of the step of the generation pre-coding matrix of one embodiment of the present of invention;
Fig. 5 illustrates the block diagram of the terminal of implementing according to one embodiment of the present of invention;
Fig. 6 illustrates the block diagram of the base station of implementing according to one embodiment of the present of invention.
In institute's drawings attached, same or analogous Reference numeral represents same or analogous function and feature.
Embodiment
Fig. 1 illustrates according to one embodiment of the present of invention, carries out in terminal, is used for the flow chart of the method for recommendation precoding.In the method 100, terminal at first receives a plurality of signals of being sent by the base station in step S110, and measures the channel response corresponding to a plurality of channels of these a plurality of signals of transmission, produces a channel response matrix.The channel response of the transmission channel between the transmitting antenna of reception antenna of this terminal and corresponding base station has been described in each unit of this channel response matrix.
In step S120, terminal is precoding of each taking-up from a known predefine precoding group, utilizes the channel response matrix that obtains in S110, calculates one corresponding to a channel condition information of this precoding.After all precodings in having traveled through this predefine precoding group, terminal has just obtained the different channels state information corresponding to different precodings.Wherein, channel condition information can be signal to noise ratio snr, signal interference ratio SINR, or channel quality indicator CQI.Channel condition information can be according to formula CSI i = t i H H H Ht i Σ j ∉ φ i t j H H H Ht j + N 0 , I={1 ..., M} calculates, wherein, t iRepresent predefine precoding group T={t 1, t 2... t MIn i precoding, H represents channel response matrix, φ iRepresent in the predefine precoding group except t iOutside the set that forms of remaining precoding, N 0Represent the noise variance of channel, CSI iRepresentative is corresponding to precoding t iChannel condition information.
In step S130, utilize the correlated characteristic between each precoding, and corresponding channel condition information, produce one and recommend precoding group, wherein, each recommendation precoding is a precoding in this predefine precoding group.
In step S140, terminal will recommend precoding group and corresponding channel condition information to send to the base station, and wherein, each channel condition information is recommended precoding corresponding to one.Alternatively, namely each can be recommended precoding itself send it back the base station, also the call number of this recommendation precoding in the predefine precoding group can be sent it back the base station, to save bandwidth.
According to one embodiment of the present of invention, Fig. 2 illustrates the flow chart that produces the method for recommending precoding group among the step S130.At first in step S210, from a plurality of channel condition informations, select to have peaked channel condition information.In step S220, by the corresponding relation of channel condition information and precoding, find corresponding precoding, recommend precoding to join as first and recommend in the precoding group.In step S230, utilize the correlated characteristic between the different precodings, remaining channel condition information is weighted, to obtain a plurality of weighting channel condition informations.Alternatively, the weighting operation can be according to formula CSI Current(i)=f (e i, e j) αCSI Previous(i) β, wherein, f (e i, e j) be precoding e iAnd e jCoefficient correlation, precoding e jThe first recommendation precoding, precoding e iThe precoding corresponding to this channel condition information, CSI Previous(i) be channel condition information, CSI Current(i) be the weighting channel condition information.Wherein, coefficient correlation can be by formula f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | 2 Or f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | Calculate.In step S240, from a plurality of weighting channel condition informations, select maximum weighting channel condition information, and in step S250, determine corresponding precoding, join as new recommendation precoding and recommend in the precoding group.In step S260, judge whether to have finished recommendation step with a predefined standard, if do not finish, then return step S230 and continue; Otherwise, enter into step S140.Whether this predefined standard can recommend the precoding of predefine number, or whether remaining channel condition information except recommending channel condition information corresponding to precoding is greater than a predefined threshold value, to such an extent as to be necessary to proceed to recommend etc.By step S230, S240, in the repeatedly cycling that S250 forms, formula CSI Current(i)=f (e i, e j) αCSI Previous(i) βIn CSI Previous(i) can also represent current current weighting step weighting channel condition information before, CSI Current(i) can also represent the weighting channel condition information that current current weighting step obtains.
By the embodiment among Fig. 1 and Fig. 2, terminal can produce a recommendation precoding group that comprises a plurality of recommendation precodings, and will recommend precoding group and corresponding channel condition information to send to the base station, is carried out the selection optimization of precoding by the base station.By contrast, the method that provides of EP1699145A2 only determines that by the size of signal to noise ratio relatively terminal thinks only precoding.
Fig. 3 illustrates according to one embodiment of the present of invention, carries out in the base station, for the flow chart of selecting the method for the transmission of data by optimizing precoding.In method 300, the base station at first sends a plurality of signals to a plurality of terminals in step S310, and wherein each signal can be pilot signal or the signal that comprises pilot signal.Pre-encode operation is not carried out to this pilot signal or pilot portion in the base station, measures corresponding channel response for the pilot signal that terminal receives by assessment.In step S320, the base station receives a plurality of feedback signals of sending from a plurality of terminals, and at least one feedback signal comprises the channel condition information of a plurality of recommendation precodings and a plurality of correspondences.Alternatively, the recommendation precoding that comprises in the feedback signal namely can be precoding vector, also can be the call number of this precoding vector in a predefine precoding group, utilizes this call number can determine corresponding precoding vector.In step S330, the base station utilizes the correlated characteristic between the recommendation precoding all acquisitions or that satisfy the predefine condition, produces a pre-coding matrix.Each precoding in this pre-coding matrix is that from the recommendation precoding set that terminal is sent recommends precoding, and its deterministic process has been utilized correlated characteristic and the corresponding channel condition information of recommending between the precoding.After having obtained pre-coding matrix, the base station utilizes this pre-coding matrix that follow-up signal is transmitted operation in step S340.
Fig. 4 illustrates according to one embodiment of the present of invention and provides, and produces the flow chart of the method for pre-coding matrix.In step S330, maximum channel condition information is at first selected in the base station from all channel condition informations that receive in step S410, and in step S420, determine corresponding to the precoding of this maximum channel state information and the terminal of correspondence, and determine a transmitting antenna of precoding and definite terminal corresponding to this, should determine to distribute that precoding was to this transmitting antenna; In step S430, for remaining each channel condition information, the base station is determined precoding according to this and corresponding to the coefficient correlation between the precoding of this channel condition information, this channel condition information is weighted, to obtain the weighting channel condition information of a correspondence.The weighting operation can be according to formula CSI Current(i)=f (e i, e j) αCSI Previous(i) β, wherein, f (e i, e j) be precoding e iAnd e jCoefficient correlation, precoding e jTo determine precoding, precoding e iThe precoding corresponding to channel condition information, CSI Previous(i) be channel condition information, CSI Current(i) be the weighting channel condition information.Coefficient correlation can be by formula f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | 2 Or f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | Calculate.Afterwards, maximum weighting channel condition information is selected in the base station from all weighting channel condition informations in step S440, and in step S450, determine corresponding to the precoding of this maximum weighted channel condition information and the terminal of correspondence, and determine a transmitting antenna of precoding and definite terminal corresponding to this, should determine to distribute that precoding was to this transmitting antenna.In step S460, judged whether to obtain enough definite precodings, whether can form a pre-coding matrix, if do not have, then return step S430 and continue operation; Otherwise generate this pre-coding matrix, enter step S340.By step S430, S440, in the repeatedly cycling that S450 forms, formula CSI Current(i)=f (e i, e j) αCSI Previous(i) βIn CSI Previous(i) can also represent current current weighting step weighting channel condition information before, CSI Current(i) can also represent the weighting channel condition information that current current weighting step obtains, precoding e jDefinite precoding of determining in the last cycling, precoding e iIt is the precoding corresponding to the channel condition information in the current weighting operation.
Be different from the method that EP1699145A2 proposes, the method of utilizing the embodiment among Fig. 3 and Fig. 4 to provide, the pre-coding matrix that obtains can be unitary matrice, it is quadrature between any two precoding vectors, can not unitary matrice also, namely existing between two precoding vectors is not strict orthogonal, and its coefficient correlation is less than 1.Utilize the method among the embodiment of Fig. 3 and Fig. 4 can select namely have better correlation, be that coefficient correlation is larger, and the response of corresponding channel status is also larger, pre-coding matrix, thereby so that distribute to each antenna with better suited precoding, so that corresponding terminal can obtain larger message transmission rate, and then whole system obtains larger total message transmission rate and power system capacity.
For the method for utilizing the present invention to propose, Fig. 5 illustrates one according to the block diagram of the terminal of one embodiment of the present of invention enforcement.Terminal 500 comprises: 530, one recommendation unit 540 of 520, one computing units of 510, one evaluators of a receiving element, and a transmitting element 550.Receiving element 510 is used for receiving a plurality of signals of sending from the base station.Evaluator 520 is for assessment of a channel response matrix corresponding to the reception signal, and each unit in the channel response matrix is used for describing the channel response of a corresponding channel of signal.Computing unit 530 is used for, and utilizes a predefine precoding group and channel response matrix, calculates a plurality of channel condition informations, and each channel condition information is corresponding to a precoding in this predefine precoding group.Recommendation unit 540 is used for, and based on the coefficient correlation between each precoding and corresponding channel condition information, produces one and recommends precoding group, and wherein, each recommendation precoding is a precoding in this predefine precoding group.Transmitting element 550 is used for sending a plurality of channel condition informations of recommendation precoding group and correspondence to described base station.
Wherein, computing unit 530 comprises: first selector 532 is used for selecting a precoding from this predefine precoding group; With a channel condition information calculator 534, be used for calculating channel condition information.
Recommendation unit 540 comprises: 544, one generators 546 of 542, one determining units of second selector and a weighting device 548.Second selector 542 is used for selecting maximum channel condition information.Determining unit 544 is used for definite precoding corresponding to the maximum channel state information.Generator 546 is used for the precoding that determining unit is selected and joins the recommendation precoding group.Weighting device 548 is used for described a plurality of channel condition informations are weighted respectively operation, it further comprises: a Calculation of correlation factor device 5481 is used for calculating the coefficient correlation of two precodings, with a multiplier 5482, be used for this coefficient correlation and a corresponding channel condition information are multiplied each other, to upgrade corresponding channel condition information.
For the method for utilizing the present invention to propose, Fig. 6 illustrates one according to the block diagram of the base station of one embodiment of the present of invention enforcement.Base station 600 comprises: 610, one generators 620 of a receiving element and a transmission unit 630.Receiving element 610 users receive a plurality of feedback signals that send from a plurality of terminals, and wherein, at least one feedback signal comprises a plurality of recommendation precodings and corresponding a plurality of channel condition informations.Generator 620 generates a pre-coding matrix based on described a plurality of feedback signals, and wherein, at least one precoding in the pre-coding matrix is based at least two and recommends coefficient correlations between the precoding to determine.Transmission unit 630 is used for utilizing described pre-coding matrix to carry out the transmission operation.Transmission unit 630 further transmission does not pass through the signal of precoding.
Wherein, generator 620 comprises: 624, one distributors 626 of 622, one determining units of a selector and a weighting device 628.Selector 622 is used for selecting maximum channel condition information from a plurality of channel condition informations.Determining unit 624 is used for a definite precoding and terminal corresponding to the maximum channel state information, and corresponding transmitting antenna.Distributor 626 is used for described definite transmitting antenna is distributed in described definite precoding.Weighting device 628, be used for a plurality of channel condition informations are weighted respectively operation, further comprise: a Calculation of correlation factor device 6281, be used for calculating the coefficient correlation of two precodings, with a multiplier 6282, be used for this coefficient correlation and a corresponding channel condition information are multiplied each other, to upgrade this channel condition information.
It will be appreciated by those skilled in the art that method and device thereof that each embodiment of the present invention proposes, can make various improvement not breaking away from basis of the present invention.Therefore, protection scope of the present invention should be determined by the content of appending claims.

Claims (22)

1. method that is used for recommending in the terminal of multi-user MIMO system precoding, described method comprises:
(a) utilize a plurality of reception signals, calculate a channel response matrix, wherein, each unit of described channel response matrix is for the channel status response of a channel between the base station of describing described terminal and a correspondence;
(b) utilize a predefine precoding group and described channel response matrix, calculate a plurality of channel condition informations, each channel condition information is corresponding to a precoding in the described predefine precoding group;
(c) utilize the correlation between each precoding and described a plurality of channel condition information in the described predefine precoding group, from described predefine code set, select a plurality of precodings to recommend precoding group as one; With
(d) based on described recommendation precoding group and corresponding a plurality of channel condition informations, produce a feedback signal, send to described base station, wherein, recommend precoding for one in the corresponding described recommendation precoding group of each channel condition information difference.
The method of claim 1, wherein in step (b) according to formula Calculate channel condition information, wherein, t iRepresent described predefine precoding group T={t 1, t 2... t MIn i precoding, H represents described channel response matrix, φ iRepresent in the described predefine precoding group except t iOutside the set that forms of remaining precoding, N 0Represent the noise variance of channel, CSI iRepresentative is corresponding to precoding t iChannel condition information.
3. the method for claim 1, wherein step (c) further comprises:
(i) from described a plurality of channel condition informations, select a maximum channel state information;
(ii) a definite precoding corresponding to described maximum channel state information is recommended precoding as first in the described recommendation precoding group;
(iii) for remaining each channel condition information, based on described the first recommendation precoding with corresponding to the coefficient correlation between the precoding of described channel condition information, described channel condition information is weighted operation, to produce a weighting channel condition information;
(iv) from described a plurality of weighting channel condition informations, select a maximum weighted channel condition information; With
(v) determine one corresponding to the precoding of described maximum weighted channel condition information, recommend precoding as second in the described recommendation precoding group.
4. method as claimed in claim 3, wherein, the step below step (c) is further repeatedly carried out:
I) for each the weighting channel condition information that in a front weighting step, produces, according to the coefficient correlation between the recommendation precoding of determining corresponding to the precoding of described weighting channel condition information with in a front determining step, described weighting channel condition information is carried out the weighting operation, to upgrade described weighting channel condition information;
II) the weighting channel condition information of a maximum of selection from a plurality of weighting channel condition informations that step (I), produce; With
III) determine a precoding corresponding to the weighting channel condition information of described maximum, as recommending precoding, to add described recommendation precoding group.
5. method as claimed in claim 4, wherein, described weighting channel condition information is according to formula CSI Current(i)=f (e i, e j) αCSI Previous(i) βCalculate generation, wherein, f (e i, e j) be precoding e iAnd e jCoefficient correlation, precoding e jThat first in the step (iii) recommended one of any in the recommendation precoding in precoding and the step (I), precoding e iCorresponding to one of any corresponding in the precoding of described weighting channel condition information in the precoding of described channel condition information and the step (I), CSI in the step (iii) Previonus(i) be channel condition information in the step (iii) and any one channel condition information in the weighting channel condition information in the step (I), CSI Current(i) be one of any in weighting channel condition information in the step (iii) and the weighting channel condition information in the step (I), α and β are respectively predefined natural numbers.
6. method as claimed in claim 5, wherein, described coefficient correlation is by formula f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | 2 With f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | In any one calculate, wherein, f (e i, e j) be precoding e iAnd e jCoefficient correlation, precoding e iAnd e jBe the precoding in the described predefine precoding group, H represents channel response matrix.
7. the method for claim 1, wherein described feedback signal comprises that in the described recommendation precoding group each recommend one of any in precoding and the call number of described recommendation precoding in described predefine precoding group.
8. the method for claim 1, wherein each described reception signal is independently one of an any signal by obtaining behind the transmission in the predefine pilot frequency sequence in predefine pilot signal and the signal.
9. the method for claim 1, wherein channel condition information is signal to noise ratio, signal interference ratio, and one of any in the channel status indication.
10. method that is used at the multi-user MIMO system the transmission of data, described multi-user MIMO system comprises a base station and a plurality of terminal, described method comprises step:
(a) receive a plurality of feedback signals of sending from described a plurality of terminals, at least one feedback signal comprises a plurality of recommendation precoding informations and a plurality of channel condition information, each channel condition information is recommended precoding information corresponding to one, and each recommends precoding information to be respectively applied to determine that corresponding in a predefine precoding group precoding is with as the recommendation precoding;
(b) based on described a plurality of feedback signals, produce a pre-coding matrix, wherein, at least one precoding in the described pre-coding matrix is based at least two and recommends coefficient correlations between the precoding to determine; With
(c) utilize described pre-coding matrix to carry out the transmission operation.
11. method as claimed in claim 10 in step (a) before, further comprises step:
Send a plurality of pilot signals of precoding of not passing through to described a plurality of terminals.
12. method as claimed in claim 10, wherein, at least two precodings in the described pre-coding matrix are non-orthogonal.
13. method as claimed in claim 10, wherein, step (b) further comprises step:
(i) from all channel condition informations, select a maximum channel state information;
(ii) determine a precoding and a terminal corresponding to described maximum channel state information, and corresponding to a transmitting antenna of described definite precoding and described definite terminal, to distribute described definite precoding to described transmitting antenna;
(iii) for remaining each channel condition information, according to described definite precoding with corresponding to the coefficient correlation between the precoding of described channel condition information, described channel condition information is weighted operation, to obtain a corresponding weighting channel condition information;
(iv) from all weighting channel condition informations that step (iii), produce, select a maximum weighted channel condition information; With
(v) determine a precoding and a terminal corresponding to described maximum weighted channel condition information, and corresponding to a transmitting antenna of described definite precoding and described definite terminal, to distribute described definite precoding to described transmitting antenna.
14. method as claimed in claim 13, wherein, step (b) is further repeatedly carried out following step:
(I) for each the weighting channel condition information that in a last time weighting step, produces, according to definite precoding last time determining in the determining step at one with corresponding to the coefficient correlation between the precoding of described weighting channel condition information, described weighting channel condition information is weighted operation, to upgrade described weighting channel condition information;
(II) from all weighting channel condition informations that step (I), upgrade, select a maximum weighted channel condition information; With
(III) determine a precoding and a terminal corresponding to described maximum weighted channel condition information, and corresponding to a transmitting antenna of described terminal, to distribute described definite precoding to described transmitting antenna.
15. method as claimed in claim 14, wherein, described weighting channel condition information is according to formula CSI Current(i)=f (e i, e j) αCSI Previous(i) βCalculate and produce f (e i, e j) be precoding e iAnd e jCoefficient correlation, precoding e jDescribed definite precoding, precoding e iBe in the step (iii) corresponding to one of any corresponding in the precoding of described weighting channel condition information in the precoding of described maximum channel state information and the step (I), CSI Previous(i) be one of any in channel condition information in the step (iii) and the weighting channel condition information in the step (I), CSI Current(i) be one of any in the weighting channel condition information after upgrading in weighting channel condition information in the step (iii) and the step (I), α and β are respectively predefined natural numbers.
16. method as claimed in claim 15, wherein, described coefficient correlation is by formula f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | 2 With f ( e i , e j ) = 1 - | e i H e j | | e i | | · | | e j | | | In one of any calculating produce, wherein, f (e i, e j) be precoding e iAnd e jBetween coefficient correlation, H represents channel response matrix.
17. a device that is used for recommending at multi-user MIMO system precoding comprises:
A receiving element is used for receiving a plurality of signals of sending from a base station;
An evaluator, for assessment of a channel response matrix corresponding to described a plurality of reception signals, wherein, each unit in the described channel response matrix is used for describing the channel response of a corresponding channel of signal;
A computing unit is used for, and utilizes a predefine precoding group and described channel response matrix, calculates a plurality of channel condition informations, and each channel condition information is corresponding to a precoding in the described predefine precoding group;
A recommendation unit is used for, and based on the coefficient correlation between each precoding in the described predefine precoding group and described a plurality of channel condition information, selects a plurality of precodings to recommend precoding group as one from described predefine code set; With
A transmitting element, a plurality of channel condition informations that are used for sending described recommendation precoding group and correspondence wherein, are recommended precoding for one in the corresponding described recommendation precoding group of each channel condition information difference to described base station.
18. device as claimed in claim 17, wherein, described computing unit further comprises:
First selector is used for selecting a precoding from described predefine precoding group; With
A channel condition information calculator is used for, according to formula
Figure FSB00000897744500061
Calculate channel condition information, wherein, t iRepresent the precoding that described first selector is chosen, H represents described channel response matrix, φ iRepresent in the described predefine precoding group except t iOutside the set that forms of remaining precoding, N 0Represent the noise variance of channel, CSI iRepresentative is corresponding to precoding t iChannel condition information.
19. device as claimed in claim 17, wherein, described recommendation unit comprises:
Second selector is used for selecting maximum channel condition information from described a plurality of channel condition informations;
A determining unit is used for definite precoding corresponding to described maximum channel state information;
A generator is used for the precoding that described determining unit is selected and joins described recommendation precoding group;
A weighting device is used for described a plurality of channel condition informations are weighted respectively operation, and described weighting device further comprises:
A Calculation of correlation factor device is used for calculating the coefficient correlation of two precodings; With
A multiplier is used for described coefficient correlation and a corresponding channel condition information are multiplied each other, to upgrade corresponding channel condition information.
20. a device that is used at the multi-user MIMO system the transmission of data comprises:
A receiving element, be used for receiving a plurality of feedback signals that send from a plurality of terminals of described multi-user MIMO system, wherein, at least one feedback signal comprises a plurality of recommendation precoding informations and corresponding a plurality of channel condition informations, and each recommends precoding information to be respectively applied to determine that corresponding in a predefine precoding group precoding is with as the recommendation precoding;
A generator is used for, and based on described a plurality of feedback signals, generates a pre-coding matrix, and wherein, at least one precoding in the described pre-coding matrix is based at least two and recommends coefficient correlations between the precoding to determine; With
A transmission unit is used for utilizing described pre-coding matrix to carry out the transmission operation.
21. device as claimed in claim 20, wherein, described transmission unit is further used for transmitting the signal that does not pass through described pre-coding matrix precoding.
22. device as claimed in claim 20, wherein, described generator further comprises:
A selector is used for selecting maximum channel condition information from a plurality of channel condition informations;
A determining unit be used for to be determined a precoding and a terminal corresponding to described maximum channel state information, and corresponding to a transmitting antenna of described definite precoding and described definite terminal;
A distributor is used for described definite transmitting antenna is distributed in described definite precoding;
A weighting device is used for described a plurality of channel condition informations are weighted respectively operation, and described weighting device further comprises:
A Calculation of correlation factor device is used for calculating the coefficient correlation of two precodings; With
A multiplier is used for described coefficient correlation and a corresponding channel condition information are multiplied each other, to upgrade corresponding channel condition information.
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